Friction shock-absorbing mechanism



s, B. HASELTINE FRIGTION SHOCK ABsoRBING MEGHANISM Filed sept. 12, 1924 2 sheets-sheet 1 By W @i Nov, 2 1926.

Nov. 2 1926. 1,605,024

s. B. HASELTINE 4 FRICTION SHOCK ABSORBING MECHANISM A med 1924 2 2 ,U al

Maly/ l WM5@ j @wwf W l @M Y i The front and r Patented Nov. 2,'

-ir star 1,605,024 PATENT rica,

STACY B. HASLTINE, OIE' CEIL'CLG'O, ILINOIS, ASSGNQR, MESNE ASSIGNMENTS, TO

i W. 4II. MNER, ING., A CORPORATION OF `DELAWARE FRICTION SHOCK-ABSORBING MECHANISIVI.

Application filed September 12, 1924, Serial No. 737,349.

Vanother object of the invention is to provide a mcchanisl'n of the character indicated, ,:oinprising relatively movable end followers and a friction wedge system including a friction element having `longitudinally disposed friction surfaces, wherein the followers are provided with wedge means cooperating with the friction system.

Other objects and advantages kof the invention will more clearly and fully appear from the description and claims hereinafter following. A Y

'ln the `drawings forming apart of this specification, Figure 1 is a horizontal, longitudinal, sectional View of a portion of a railway draft rigging, showing my improvements in connection therewith. `Figures 2 and 3 are verticahtransverse, sectional views corresponding respectively tozthe lines 2,-2 and 3-3 of Figure 1. And Figures l and 5 are detail, perspective views respectively of a wedge block and a friction element used in connection with my improved mechanism. Vln said drawings, 10-10 denote channelshaped center or draftsills of a railway car uuderframe tothe inner faces ofwhich are secured front stop lugs 11-11 and rear stop lugs 12`12. The` inner end portion of the drawbar is indicated at 13 to which is operatively connected a hooded yoke 14 of `usual construction. Withinthe yoke is disposed the shock absorbing mechanism proper. .The yoke and the parts therewithin are supported in operative position by a de- `tachable"saddle platev15.

The improvedshockabsorbing mechanism proper was shown comprises broadly front and`i'ea1follower casings rif-A; two' wedge blocks B-B; four friction wedge shoes C-C; a friction element D; a locking bar E; spring'resistance elements F-fFg and a retainer bolt G.

ear follower Ycasings A are of generally rectangular formA and have spaced top and bottom'walls 1G-16,2 spaced side walls 17H17 anda transverse end wall lia. the end wall 18`extending at opposite sides beyond the side walls 17 and being thickened as shown/and co-operating with' thecorresponding stop lugs of the draft sills.v Tlieside walls 17, at 'the inner `end ofeach casing are flared laterally `as indicated at 19 providing interior opposed wedge faces 20 diverging inwardly of the mechanism Thecasings A; are preferably reinforced by webs 21 extending longitudinally thereof between the `end walls and the flared portions of the side walls.

The wedoe blocks D, which are two in number, are disposed on opposite sides of the mechanism, each block (zo-operating with the wedge faces 2O of the front and rear casings A at the corresponding side .of the mechanism. r)The blocks B are of like c0nstruction and each is provided with a pair of outer wedge faces 120 correspondingly inclined to and adapted to co-operate with the wedge faces 2O ofthe front and rear casings, respectively. On the innery side, that is, the side nearest the aXis of the mechanism, each of the blocks B is provided with a pair of front and rear wedge faces 2., adapted to co-operate with the corresponding ysetof friction shoes C. The wedge faces and 120 at the corresponding end of each block B converge outwardly as clearly shown lin Figures 1 and 4t. v

The friction wedge shoes C, which are four in number, are also of like construction, eachV shoe being provided with a flat' friction face23 on the inner side thereof adapted to co-operatc with Vthe friction element D. Each shoe is also pro* vided with an Vouterv wedge face 122 thereof adapted to respectively co-operatev e `with the friction surfaces 23 of the shoes C at the opposite sides of the mechanism. The element D is provided with cylindrical extensions at the front and rear ends thereof, thecextensions 24 being provided with fiat side faces, the fiat faces of the front and rear extensions forming continuatjions of the side friction surface 4123 and adapted to function as guides to prevent tilting of the shoes C? during their outward movement away from each other. rlhe friction element D and the wedge blocks are maintained in centeredrelation with reference to each other by means of the locking bar E which extends through a rectangular opening Q5 provided in the element D. and having its opposite ends extending into openings 26 provided in the respective wedge blocks B, the bar E having Aa loose working fit in said openings 26 to permit relatively free lateral approach of the blocks B and still prevent appreciable displacenent thereof longitudinally of the mechanism with reference to the friction element D.

The spring resistance elements F are tandem arranged, one of the same being disposed in each of the casings A and having its opposite ends bearingyrespectively on the end wall 18 of the casing and the out-er end faces of a pair of the friction wedge shoes C. Each spring resistance element F comprises a relatively light inner coil and a relatively heavy outer coil, the inner coil being held in central position by the corresponding projection 24 on the friction element D and a hollow boss 27 inwardly projecting` from the end wall 18 of the corresponding casing. ln the normal full release position of the parts, a clearance is provided between the front and rear ends of the friction element D and the inner ends of the front and rear spring resistance elements F, thereby allowing the initial compresssion onv Vthe latter to the various wedging faces in close relation as wear develops thereon.

The retainer bolt G has its opposite ends anchored in thel hollow bosses 27 of the front and rear follower casings respectively and serves to maintain the parts in assembled relation and under initial compression. The shank of the bolt extends through aligned openings provided in the element D and the locking bar E.

As wear occurs on nthe various friction and wedge surfaces, compensation therefor will be had by the springs, which are under compression, forcing the shoes C toward each other, suthcient clearance being provided between the inner ends of the shoes and the locking bar E to allow for this movement.

The operation of my improved shock absorbing mechanism is as follows, assuming a compression stroke. rlhe front and rear follower casings A will be moved relatively toward each other, compressing the front and rear spring resistance elements F and effecting a wedging action between the wedge faces of the casings and the wedge bloclrs B, forcing the latter laterally to- -ward each other, wedging the front and rear friction shoes C apart and eecting an vadditional compression of the spring resistance element-s. As the friction shoes C are moved apart, friction will be created between the same and the surfaces 123 of the friction element D in addition to the friction created between the wedge faces of the blocks B and the wedge faces of the casings A and shoes C, respectively. The described action will continue until the actuating force is reduced or the inner ends of the front and rear 'casings come into abutment. In the latter case, the casings A will function as a solid column for transmitting the pressure directly to the corresponding stop lugs. It will be evident that the casings A coming into abutment, will limit Vthe compression of the springs F, thereby preventing the same from being injured by being driven solid. v

lWhen the actuating pressure is reduced, the springs will force the follower casings apart, reducing the wedging action on the blocks B, permitting the springs to force the shoes@ to vard each other and return the parts to normal position.

l have herein shown and described what I now consider the preferred manner of carrying out my invention, but the same is merely illustrative, and I contemplate all changes and modifications that come within the scope of the claims appended hereto.

l claim:

1. In a friction shock absorbing mechanism, the combination with relatively movable follower acting members, each of said members havingV wedge faces thereon; of a pair of wedge blocks each having wedge faces cooperating with said front and rear follower members,said blocks being adapted to be moved toward each other during the relative approach of the followers; a pair `of friction wedge shoes co-operating with the front and rear ends of each wedge block; a friction element having elongated friction surfaces co-operating with all of said shoes; and a main spring resistance co-operating with each follower member and the friction shoes at the corresponding ends of the wedge blocks.

2. In a friction shock absorbing mechanism, the combination with relatively movable front and rear follower actin@- casings, each casing having a plurality of interior wedge faces; ofa spring resistance in each casing; wedge blocks interposed between said casings and co-operating with the wedge faces thereof; a friction element interposed between said wedge blocks, said element having friction surfaces disposed longitudinally of the mechanism; and a plurality of friction shoes co-operating with said wedge blocks, each shoe having a friction face co-operating with one of the friction surfaces of said element.

3. In a friction shock absorbing mechanism, the combination with relatively movable front and Vrear followers; of a wedge block disposed at each side of the mechanism, said blocks and followers having cooperating wedge face thereon for forcing said wedge blocks relatively toward each other upon relative approach of said followers; a longitudinal vfriction element relatively to which both of said followers are movable; friction wedge shoes co-operating with said element and blocks; and means for yieldingly resisting movement of said shoes.

4. In a friction shock absorbing mechanism, the combination with front and rear follower casings having opposed wedge faces on the interior thereof; of pair of wedge blocks at opposite sides of the mechanism interposed between said follower casings and (so-operating with the wedge faces thereof; a central friction element having longitudinally disposed friction surfaces on opposite sides thereof; a plurality of friction wedge shoes co-operating with each friction surface of said element and having wedging engagement with the wedge block at the corresponding side of the mechanism; and a main spring resistance element within each casing and co-operating with the friction wedge shoes at the corresponding end of the mechanism.

5. In a friction shock absorbing mechanism, the Combination with front and rear follower ycasings having interior opposed wedge faces at the inner ends thereof; a

longitudinally disposed frictionk element interposed between said casings; a plurality of friction wedge shoes co-operating with said friction element;i a spring resistance within eachy casing co-operating with the corresponding friction shoes; a pair of wedge blocks co-operating with the friction shoes, said blocks being interposed between the front and rear follower casings and having wedge faces co-operating with the wedge faces of said casings.

(3. In a friction shock absorbing mechanism; the combination with front and rear follower casings, relatively movable toward and from each other; a pair of wedge blocks interposed between said casings, Vsaid blocks andcasings having co-operating wedge faces; a friction wedge system co-operating` with said wedge blocks, said system includingI a longitudinally disposed friction element; and means co-acting with said friction element aud wedge blocks for maintaining the same in relatively centered relation.

In witness that I claim the foregoing I have hereunto subscribed my name this 4th day of September 1924,

sTAoY B. HAsEL'rINE. 

